80k is the federal legal weight limit for a truck and trailer, and that's spread across 5 axles. and any single axle can't be over 20k. an f650 is big by pickup standards but midsize at best by commercial truck standards. look at any pictures of f650's in use and the biggest loads they pull are single-axle beer trailers. no trucking company is pulling their 53' tandem axle trailers with f650's
almost any trailer approaching weight limits is going to be attached to a fifth-wheel, which puts load on the truck frame by design. literally the reason we call them semi-trailers. you'll never see anything with a pickup bed hitting 80k gvw
sure, you can upgrade the entire drivetrain and suspension and reinforce the frame to get an f650 to handle nearly double it's rated capacity, but at that point you're just putting an f650 cab on a truck fit for the job. OPs pic is an f650 with an f350 bed slapped on it and a few other cosmetics